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Old 01-09-2013, 03:15 AM   #1
TheHammer0309
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Default Pilsner tastes funny after it was kegged...

Hello all,

I am new to HBT but have been brewing for about 3 years (1 year extract, 2 years all grain). Until recently I have only brewed ales, with good sucess. I recently made my first pilsner, a German Pilsner, that tasted amazing after I lagered it for 1 month @ 35-37 degrees. After lagering I transfered to serving keg and hooked it up to co2. After 1 week in keezer I took a sample and the flavor was WAY different? It had a funny taste? Almost a real malty/acid flavor? Carbonic acid maybe? Any ideas???

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Old 03-21-2014, 02:00 PM   #2
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Default Similar issue

Bumping this year old thread that received no response.

I too recently attempted my first Bohemian pilsner. After a nice, cool fermentation -- the only good thing that came out of this winter weather -- the beer tasted great pre-lagering. Fermentation took about three weeks. I actually lagered in the keg for six weeks. Immediately after placing the keg on Co2, I transferred a bit and carbonated with my Carbonator that night. It tasted wonderful and had the beautiful hop aroma from all the Saaz hops. After a few days, I knew it was not fully carbed and did the same as my girlfriend wanted to try. Again, it tasted very good and still had aroma; the wait was to have in fully carbed on the keg and to clear a bit more. After sitting on Co2 for over a week at 12 psi, it is just about carbonated but has lost all of the aroma and some of the flavor has degraded. It's nice and clear but not the same.

A few things:

I've had this happen to other beers I've had on this Co2 tank (e.g., milk stout, amber, American brown ale). I chalked this up to something I was doing. Each time I brewed again, I changed something. I began closely monitoring fermentation temperatures to make sure I was in the appropriate range for different yeasts. I've made sure to use filtered or spring water. I've cleaned my kegs religiously and bought these new a year ago. I clean with PBW or Oxyclean and use StarSan for sanitizing. I use the Oxyclean and BLC on rotation to clean taplines and flush with hot water after cleaning. I do this every two weeks now to ensure the lines are always clean. In other words, I'm very clean and have tried to address any sanitation issues. I have my girlfriend double-inspect everything -- an extra set of eyes can't hurt.

Why is it the flavor changes significantly for the worse? Could the Co2 be contaminated? When I use the carbonator, the forced Co2 isn't "sitting" on the beer in comparison to the keg. I buy my Co2 from a welding supply company.

I'm hoping to solve this issue on my own. I'm brewing a Citra American-style Hefeweizen today. I plan on bottling half and kegging the other half. Hopefully this will help me trouble shoot the issues. In the meantime, any thoughts?

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Old 03-21-2014, 02:49 PM   #3
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I had another thread on this issue a few weeks back. Same prob, sounds like same taste. As I have 2 kegs on same tank and other is fine I know its not co2. Only thing I can figure is I'm not rinsing PBW out good enough or its the residue from when I spray the inside of tank with starsan??

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Old 03-21-2014, 09:45 PM   #4
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That's a possibility on my end as well. The last keg I went nuts on in terms of cleaning; I inspected it with a flashlight after a thorough rinse. So hopefully if that is the case, I'll eliminate this issue as well. I also might switch out the Co2 for my next experiment batch in which I bottle half of the batch and keg half of the batch for comparison.

And I can say I'm probably also being over-critical of my pilsner. It actually doesn't taste bad just not as hoppy as it first was.

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Old 03-21-2014, 09:48 PM   #5
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Quote:
Originally Posted by quiet_dissent View Post
That's a possibility on my end as well. The last keg I went nuts on in terms of cleaning; I inspected it with a flashlight after a thorough rinse. So hopefully if that is the case, I'll eliminate this issue as well. I also might switch out the Co2 for my next experiment batch in which I bottle half of the batch and keg half of the batch for comparison.

And I can say I'm probably also being over-critical of my pilsner. It actually doesn't taste bad just not as hoppy as it first was.
Since hops aroma apparently gets scrubbed out with CO2 did you check if you have a leak somewhere? Maybe all your hoppy goodness is escaping somewhere...
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Old 03-21-2014, 10:00 PM   #6
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I did an initial leak check when I kegged. I didn't realize, though, leaks could contribute to decreased hop aroma, so I'll store that away in the noggin.

It also wouldn't hurt for me to double-check as I did move things around a bit post-kegging. I'm starting to see I need to double-check many things.

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Old 03-22-2014, 12:01 AM   #7
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Be ultra paranoid about oxygenation during transfers.
Oxygen wreaks havoc on beer character, and imo aroma is the first victim.
It's really easy to miss what's going on at the keg end of a transfer tube, and if you don't flush a keg with CO2 before transfers, a boisterous transfer is putting air in your beer. Bad juju.

Having had one batch affected by a recalcitrant autosiphon a while ago I decided to completely avoid the whole aeration potential and switched to pushing with CO2 from carboy to CO2-flushed keg. With that, I've pretty much reduced any potential O2 exposure from kettle to glass to whatever air is pulled in during cold-crashing the carboy. And I have an idea for that...

Cheers!

[edit] btw, I've "kegged on [Star San] foam" for years and never noticed it contributing...anything...

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Old 03-22-2014, 01:46 AM   #8
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Let's hear it!

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Old 03-22-2014, 02:51 AM   #9
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Quote:
Originally Posted by Stealthcruiser View Post
Let's hear it!
I'm thinking a ~1 cubic foot balloon attached to a plastic ball valve attached to a short chunk of tubing that will attach to either a universal bung or a carboy cap. Fill the balloon with CO2, shut off the valve, transport to carboy about to be cold-crashed and attach to bung/cap. Open valve, close fridge door, turn controller to "Crash"...

Cheers!
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Old 03-22-2014, 10:10 AM   #10
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How do you transfer from the carboy using CO2?

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